[PATCH v2] ASoC: rockchip: i2s: use regmap_read_poll_timeout to poll I2S_CLR

From: Judy Hsiao
Date: Tue Sep 13 2022 - 23:12:53 EST


Use regmap_read_poll_timeout to poll I2S_CLR.
It also fixes the 'rockchip-i2s ff070000.i2s; fail to clear' when
the read of I2S_CLR exceeds the retry limit.

Fixes: 0ff9f8b9f592 ("ASoC: rockchip: i2s: Fix error code when fail
to read I2S_CLR")
Signed-off-by: Judy Hsiao <judyhsiao@xxxxxxxxxxxx>
Reviewed-by: Brian Norris <briannorris@xxxxxxxxxxxx>
---

changes in v2:
- Remove unused variables.
- Refine debug messages.

sound/soc/rockchip/rockchip_i2s.c | 41 ++++++++++++-------------------
1 file changed, 16 insertions(+), 25 deletions(-)

diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
index f5f3540a9e18..28c86f5e435e 100644
--- a/sound/soc/rockchip/rockchip_i2s.c
+++ b/sound/soc/rockchip/rockchip_i2s.c
@@ -126,7 +126,6 @@ static inline struct rk_i2s_dev *to_info(struct snd_soc_dai *dai)
static int rockchip_snd_txctrl(struct rk_i2s_dev *i2s, int on)
{
unsigned int val = 0;
- int retry = 10;
int ret = 0;

spin_lock(&i2s->lock);
@@ -163,18 +162,14 @@ static int rockchip_snd_txctrl(struct rk_i2s_dev *i2s, int on)
I2S_CLR_TXC | I2S_CLR_RXC);
if (ret < 0)
goto end;
- regmap_read(i2s->regmap, I2S_CLR, &val);
-
- /* Should wait for clear operation to finish */
- while (val) {
- regmap_read(i2s->regmap, I2S_CLR, &val);
- retry--;
- if (!retry) {
- dev_warn(i2s->dev, "fail to clear\n");
- ret = -EBUSY;
- break;
- }
- }
+ ret = regmap_read_poll_timeout(i2s->regmap,
+ I2S_CLR,
+ val,
+ val != 0,
+ 20,
+ 200);
+ if (ret < 0)
+ dev_warn(i2s->dev, "fail to clear: %d\n", ret);
}
}
end:
@@ -188,7 +183,6 @@ static int rockchip_snd_txctrl(struct rk_i2s_dev *i2s, int on)
static int rockchip_snd_rxctrl(struct rk_i2s_dev *i2s, int on)
{
unsigned int val = 0;
- int retry = 10;
int ret = 0;

spin_lock(&i2s->lock);
@@ -226,17 +220,14 @@ static int rockchip_snd_rxctrl(struct rk_i2s_dev *i2s, int on)
I2S_CLR_TXC | I2S_CLR_RXC);
if (ret < 0)
goto end;
- regmap_read(i2s->regmap, I2S_CLR, &val);
- /* Should wait for clear operation to finish */
- while (val) {
- regmap_read(i2s->regmap, I2S_CLR, &val);
- retry--;
- if (!retry) {
- dev_warn(i2s->dev, "fail to clear\n");
- ret = -EBUSY;
- break;
- }
- }
+ ret = regmap_read_poll_timeout(i2s->regmap,
+ I2S_CLR,
+ val,
+ val != 0,
+ 20,
+ 200);
+ if (ret < 0)
+ dev_warn(i2s->dev, "fail to clear: %d\n", ret);
}
}
end:
--
2.37.2.789.g6183377224-goog